Apparatus for projecting tuning indicia



May 11, 1937. J. 1.. M WEENY APPARATUS FOR PROJECTING TUNING INDICIA 2 Sheets-Sheet 1 Filed March 6, 1937 John 1; MC Weary May 11, 1937. McWEENY APPARATUS FOR PROJECTING TUNING mmcm 2 Sheets-Sheet 2 [206 0/: JOhiZL. M Weszz g, x/m

Patented May 11, 1937 UNITED STATES PATENT OFFICE mm APPARATUS roa raomc'mzc TUNING mmcm John LMcWeeny, Chicago, 111.

Application March a, 1931, Serial No. 129.334

8 Claims.

My invention relates to means for projecting the tuning indicia of radio receiving devices and particularly to an improvement on the apparatus disclosed in my copending applications Serial Nos. 110,461 and 120,861, filed November 12, 1936 and January 16, 1937 respectively.

In the applications above identified, I have disclosedmeans for accomplishing a desired result in two different manners, one in which the disc is moved to bring respective bands of indicia into the field of the, light, and the other in which the light and lens are moved for the same purpose, the disc remaining stationary. In the apparatus here disclosed, I provide for movement of the .light and lens, but the mechanism for accomplishing the desired result is greatly simplified and rendered commercially practical. Points of advantage in the present construction will be discussed in connection with the following description. a

The invention will be more readily understood by reference to the accompanying drawings, in which:

Fig. l is a front elevation of the pertinent portion of radio receiving apparatus. to which my invention has been applied;

Fig. 2 is a sectional view substantially on the line 2--2 of Fig. 1;

Fig. 3 is a diagrammatic illustration showing the projecting of the light field on the screen in the different positions of adjustment; and,

Fig. 4 is an elevation of the disc containing the stationary call letters.

In the drawings I illustrate a base it, within which may be provided a band switch II having a shaft l2. Mounted on the base is a variable condenser l3. A shaft [4 is connected by a transparent, friction-driven disc to a light permeable disc 16 and by gearing IE to the condenser. The disc, as shown in Fig. 1, contains indicia l1, l8, 19 arranged to be ra ially readable and disposed in radially spaced rcular bands. h

Carried by a shaft 20 supported on the base are a pair of arms 2|, 22. The shaft is connected by means of the arms 23, 24 and link 25 to the shaft l2 of the band switch. The arms are arranged one on each side of the disc l8 and the upper ends of the arms terminate at a point near a transverse center line through the axis of the disc.

The arm 2| carries at its upper end a light 26 and a ray concentrator 21, while the arm 22 carries at its upper end a lens 28. The arrangement 1 is such that as the arms are oscillated, the indicia in the respective bands are brought into the field of operation of the light and lens and the indicia are projected onto a screen 29 carried by the housing or cabinet. 7

It will be understood that while the light and lens are movable bodily, yet the projection of the indicia should be, so far as the user is concerned, properly centered in the screen. In the absence of suitable compensation, it will be seen that the projection would occur at laterally spaced points on the screen, depending on the extent to which the light and lens were shifted. I compensate for this in the manner illustrated in Figs. 3 and 4. The different bands are indicated in Fig. 4 by the circular lines and it will be noted that the station identification I8, is located at substan-' tially the center of the intermediate band. With the light and lens in the intermediate position shown in Fig. 3, the projection will be-in the line 30, directly to the center of the screen 29. The light field will be that indicated by the dotted lines 3|, 32, the field extending considerably outside the limits of the screen. With the light and lens shifted to the right as viewed in Fig. 3, it will be seen that the indicia l9 must be placed to the right of the center line of the inside band, with the result that the projection will be along the line 33 in Fig. 3, which line, likewise, contacts the screen at its center. The light field indicated by the lines 34, 35 will still take in the screen, but will not be centered thereon.

Likewise, when the light and lens are shifted to the extreme left, the indicia ".must be placed to the left of the center of the band, the projection being in the line 36.= Thus, the indicia are projected onto the same point of the screen without compensatory movement between the light and lens and merely by properly locating the indicia in the respective bands.

I have illustrated a construction in which but three bands are shown, but it will be understood that it is capable of adaptation to other forms in which a greater or less number of bands is used; also that other modifications may be made within the skill of a mechanic.

I claim:

1. In radio receiving apparatus, the combination with tuning mechanism of a light-permeable disc connected thereto, said disc having radially readable indicia thereon in a plurality of circular, radially spaced hands, a pair of arms arranged one on each side of said disc, said arms carrying at their upper ends a light and a lens respectively and pivoted for oscillation in an are that substantially intersects a transverse line able disc connected thereto, said disc having radially readable indicia thereon in a plurality of circular, radially spaced bands, a pair of arms arranged one on each side of said disc, said arms carrying at their upper ends a lightand a lens respectively and pivoted for oscillation in an are that substantially intersects a transverse line through the axis of the disc, a band switch, means connecting said arms to said switch for operation thereby, and a screen on which the indicia are projected.

3. In radio receiving apparatus, the combination with tuning mechanism of a light-permeable disc connected thereto, said disc having a plurality of bands of radially readable indicia thereon, a pair of arms one on each side of said disc on the upper ends of which are located at a point substantially in line with a transverse line through the axis of the disc, a light and a concentrator carried by one arm and a lens carried by the other arm, a common shaft on which said arms are mounted, means operable from the exterior of the apparatus for rotating said shaft to swing said arms into position to effect projection of the indicia in each of the several bands, and a screen on which said indicia are projected.

4. In radio receiving apparatus, the combination with tuning mechanism of a light-permeable disc connected thereto, said disc having a plurality of bands of radially readable indicia thereon, a pair of arms one on each side of said disc and the upper ends of which are located at a point substantially in line with a transverse line throughthe axis of the disc, a light and a concentrator carried by one arm and a lens carried by the other arm, a common shaft on which said arms are mounted, a band switch and a shaft for operating the same, means connecting said switch to said arms, whereby said arms are shifted as said band switch is adjusted, and a screen on which said indicia are projected.

5. In radio receiving apparatus,'the combination with tuning mechanism of a light-permeable disc connected thereto, said disc having radially readable indicia thereon in a plurality of circular, radially spaced bands, a pair of arms arranged one on each side of said disc, said arms carrying at their upper ends a light and a lens respectively and pivoted for oscillation in an are that substantially intersects a transverse.

line through the axis of the disc, and a screen on which the indicia are projected, the indicia associated with each band being so placed thereon that they will, when the light and lens are moved into register therewith, be projected onto substantially the center of the screen.

6. In radio receiving apparatus, the combination with tuning mechanism of a light-permeable disc connected thereto, said disc having ra-l dially readable indicia thereon in a plurality 01' circular, radially spaced bands, a, pair of arms arranged one on each side of said disc, said arms ca y n at their upper ends a light and a lens respectively and pivoted for oscillation in an arc that substantially intersects a transverse line through the axis of the disc, a band switch, means connecting said arms to said switch for operation thereby, and a screen on which the indicia are projected, the indicia associated with each band being so placed thereon that they will, whenthe light and lens are moved into register there with, be projected onto substantially the center of the screen.

'7. In radio receiving apparatus, the combination with tuning mechanism of a light-permeable disc connected thereto, said disc having a plurality of bands of radially readable indicia thereon, a pair of arms one on each 'side of said disc on the upper ends of which are located at a point substantially in line with a transverse light and lens are moved into register therewith,

be projected onto substantially the center of the screen.

8. In radio receiving apparatus, the combination with tuning mechanism of a light-permeable disc connected thereto, said disc having a plurality of bands of radially readable indicia thereon, a pair of arms one on each side of said disc and the upper ends of which are located at a point substantially in line with a transverse line through the axis of the disc, a light and a concentrator carried by one arm and a lenscarried by the other arm, a common shaft on which said arms are mounted, a band switch and a shaft for operating the same, means connecting said switch to said arms, whereby said arms are shifted as said band switch is adjusted, and a screen on which said indicia are projected, the indicia associated with each band being so placed thereon that they will, when the light and lens are moved into register therewith, be projected onto substantially the center of the screen.

, JOHN L. McWEENY. 

